`tst_chatFlow`:
- Commented out bc of `mailserver` issues and then weak.
- Added basic test scenario for sending a mention in a public chat with needed validations.
- Added basic test scenario to check a mention cannot be done if it is a non existing user.
`StatusChatScreen` updates:
- Updated join room method to validate the chat is loaded.
- Added methods for doing and verifying a mention.
`SquishDriver` updates:
- Added support in `SquishDriver` to click into a link in a text or label component.
- Minor function renames.
Closes#6879
Jonathan Rainville
Noelia
femi